반응 #58005

반응 방정식

alcohol

tert-butyl 4-{2-[(1R)-1-hydroxypropyl]-4,5-dimethylphenyl)-3,6-dihydropyridine-1(2H)-carboxylate

triphenylphosphine

imidazole

→

azide

tert-butyl 4-{2-[(1S)-1-hydroxypropyl]-4,5-dimethylphenyl}-3,6-dihydropyridine-1(2H)-carboxylate

용매

DCM

반응 조건

후처리

1. 1
   기타2Py (prepared
2. 2
   workup.ADDITIONAfter the addition
3. 3
   여과The reaction mixture was filtered through a short column of silica gel
4. 4
   세척eluted with the appropriate volume of DCM
5. 5
   기타to remove excess salts and polar byproducts
6. 6
   농축The filtrate was concentrated in vacuo
7. 7
   기타the crude residue purified by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent)

실험 절차

Diisopropylazidocarboxylate (2.96 mL, 15.1 mmol) was added dropwise to a stirred mixture of alcohol 109 (1.3 g, 3.76 mmol), Zn(N3)2.2Py (prepared according to the method described by Viaud, M-C; Rollin, P. in Synthesis, 1990,130), triphenylphosphine (3.95 g, 15.1 mmol) and imidazole (1.03 g, 15.1 mmol) in DCM (100 mL) at approximately 0° C. After the addition, the resulting mixture was allowed to warm to ambient temperature and stirred vigorously for 18 h. The reaction mixture was filtered through a short column of silica gel eluted with the appropriate volume of DCM to remove excess salts and polar byproducts. The filtrate was concentrated in vacuo and the crude residue purified by flash chromatography on silica gel (gradient elution; 0%-20% EtOAc/hexanes as eluent) to afford azide 110 as a colorless oil.

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